Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a5c9a641198f3b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 05:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7d3bdaf17d6681462f9a2119eae72b4 SHA-1: 86eadc326bb0df1059d48f059a97be120f537d50 SHA-256: b7a5c9a641198f3b6b71d189ee5b742d1bea505cdf231b8b0eecc4ab00b0bc54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=ta+bei+zhou+mantra PDF link annotation
    • https://codecs.ro/images/file/falenijolimudusot.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/57335291828.pdfIn PDF document text
    • http://sinoorchids.com/image/file/65853415688.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/dafewopekipisa.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/jesulurokabiw.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210916214531_NzU1NjQ2ODk4MTA=.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/11587105843.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/31242748480.pdfIn PDF document text
    • http://castel.lu/userfiles/files/96943765642.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/13850776059.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/4340549581.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/xavusokovapimokeroninup.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/biwexufupiwalobe.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/52670991237.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/22316e01099ddfed43a5a575091701dc/27230079126.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/rikesopukarukemogadi.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/21005465168.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/napibanenedite.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/83235738757.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/rumujinewazotekososupufex.pdfIn PDF document text
    • http://agro-partner.com/Image/files/10069954080.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/wasetuzufujedipataza.pdfIn PDF document text
    • http://birdwatching.sk/media/file/kuduzaxegejivoxo.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/xakarir.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 19344 bytes
SHA-256: 13a73cfa82b7960281f8461d0ec2b92f062f30fd99c3447dbd2c6fd58e7b26da
font_02_sfnt_off000127ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 10420 bytes
SHA-256: 3c980de420c655d3230e542916b7074e574d3c36d682a1168f5270584a797151

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